Papilloma viruses, agents for detecting them and for treating diseases caused by such viruses

Abstract

This invention relates to a DNA coding for a peptide of a papilloma virus major capsid protein. Moreover, this invention deals with a papilloma virus genome containing such a DNA. Furthermore, this invention concerns proteins coded by the papilloma virus genome and virus-like particles as well as antibodies directed thereagainst and the use thereof for diagnosis, treatment and vaccination.

Description

FIELD OF THE INVENTION

[0002] This invention relates to a DNA coding for a peptide of a papilloma virus major capsid protein. Moreover, this invention deals with a papilloma virus genome containing such a DNA. In addition, this invention concerns proteins coded by the papilloma virus genome and virus-like particles as well as antibodies directed against them and their use for diagnosis, treatment and vaccination.

BACKGROUND OF THE INVENTION

[0003] It is known that papilloma viruses infect the epithelium of human beings and animals. Human papilloma viruses (hereinafter referred to as HP viruses) are found in benign epithelial neoplasms, e.g warts, condylomas in the genital zone, and malignant epithelial neoplasms, e.g carcinomas of the skin and the uterus. Zur Hausen, 1989, Cancer Research 49:4677-4681. HP viruses are also considered for the growth of malignant tumors in the respiratory tract. Zur Hausen, 1976, Cancer Research 36:530. Besides, HP viruses are considered at least jointly responsible for the growth of squamous carcinomas of the lung. Syrjänen, 1980, Lung 158:131-142.

[0004] Papilloma viruses have an icosahedral capsid without envelope in which a circular, double-stranded DNA molecule of about 7900 bp is present. The capsid comprises a major capsid protein (L1) and a minor capsid protein (L2). Both proteins, coexpressed or L1 expressed alone, result in vitro in the formation of virus-like particles Kirnbauer et al., 1993, Journal of Virology 67:6929-6936.

[0005] Papilloma viruses cannot be proliferated in monolayer cell culture. Therefore, their characterization is extremely difficult, the detection of papilloma viruses already creating considerable problems. This applies especially to papilloma viruses in carcinomas of the skin. A reliable detection thereof and thus well-calculated steps taken thereagainst are not possible by now.

[0006] Thus, it is the object of the present invention to provide a product by which papilloma viruses can be detected, particularly in carcinomas of the skin. Furthermore, a product should be provided to be able to take therapeutic steps against these papilloma viruses.

SUMMARY OF THE INVENTION

[0007] This invention relates to a DNA coding for a peptide of a papilloma virus major capsid protein. Moreover, this invention deals with a papilloma virus genome containing such a DNA. Furthermore, this invention concerns proteins coded by the papilloma virus genome and virus-like particles as well as antibodies directed thereagainst and the use thereof for diagnosis, treatment and vaccination.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] FIG. 1 shows the base sequence and the amino acid sequence, derived therefrom, of a DNA coding for a peptide of L1 of a papilloma virus. This DNA was deposited as plasmid VS19-6 with DSM (Deutsche Sammlung von Mikroorganismen und Zellkulturen [German-type collection of micro-organisms and cell cultures]) under DSM 10104 on Jul. 11, 1995.

[0009] FIG. 2 shows the base sequence and the amino acid sequence, derived therefrom, of a DNA coding for a peptide of L1 of a papilloma virus. This DNA was deposited as plasmid VS200-1 with DSM under DSM 10096 on Jul. 11, 1995.

[0010] FIG. 3 shows the base sequence and the amino acid sequence, derived therefrom, of a DNA coding for a peptide of L1 of a papilloma virus. This DNA was deposited as plasmid VS201-1 with DSM under DSM 10097 on Jul. 11, 1995.

[0011] FIG. 4 shows the base sequence and the amino acid sequence, derived therefrom, of a DNA coding for a peptide of L1 of a papilloma virus. This DNA was deposited as plasmid VS202-8 with DSM under DSM 10098 on Jul. 11, 1995.

[0012] FIG. 5 shows the base sequence and the amino acid sequence, derived therefrom, of a DNA coding for a peptide of L1 of a papilloma virus. This DNA was deposited as plasmid VS203-2 with DSM under DSM 10099 on Jul. 11, 1995.

[0013] FIG. 6 shows the base sequence and the amino acid sequence, derived therefrom, of a DNA coding for a peptide of L1 of a papilloma virus. This DNA was deposited as plasmid VS204-4 with DSM under DSM 10100 on Jul. 11, 1995.

[0014] FIG. 7 shows the base sequence and the amino acid sequence, derived therefrom, of a DNA coding for a peptide of L1 of a papilloma virus. This DNA was deposited as plasmid VS205-1 with DSM under DSM 10101 on Jul. 11, 1995.

[0015] FIG. 8 shows the base sequence and the amino acid sequence, derived therefrom, of a DNA coding for a peptide of L1 of a papilloma virus. This DNA was deposited as plasmid VS206-2 with DSM under DSM 10109 on Jul. 13, 1995.

[0016] FIG. 9 shows the base sequence and the amino acid sequence, derived therefrom, of a DNA coding for a peptide of L1 of a papilloma virus. This DNA was deposited as plasmid VS207-22 with DSM under DSM 10102 on Jul. 11, 1995.

[0017] FIG. 10 shows the base sequence and the amino acid sequence, derived therefrom, of a DNA coding for a peptide of L1 of a papilloma virus. This DNA was deposited as plasmid VS208-1 with DSM under DSM 10103 on Jul. 11, 1995.

DETAILED DESCRIPTION OF THE INVENTION

[0018] It is the object of the present invention to provide a product by which papilloma viruses can be detected, particularly in carcinomas of the skin. Furthermore, a product is provided which enables to take therapeutic steps against these papilloma viruses.

[0019] Accordingly, the subject matter of the invention relates to a DNA coding for a peptide of a papilloma virus major capsid protein (L1), the peptide comprising the amino acid sequence of FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9 or FIG. 10 or an amino acid sequence differing therefrom by one or more amino acids.

[0020] A further subject matter of the invention relates to a DNA coding for a peptide of a papilloma virus major capsid protein, the DNA comprising the base sequence of FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9 or FIG. 10 or a base sequence differing therefrom by one or more base pairs.

[0021] The above DNA has the following sequence homology with respect to known papilloma viruses:

DNA of FIG. 1:  69.1% with respect to HP virus 65
DNA of FIG. 2:  80.7% with respect to HP virus 24
DNA of FIG. 3:  69.4% with respect to HP virus 48
DNA of FIG. 4:  66.3% with respect to HP virus 48
DNA of FIG. 5:  66.9% with respect to HP virus 65
DNA of FIG. 6:  66.4% with respect to HP virus 65
DNA of FIG. 7:  69.1% with respect to HP virus 4
DNA of FIG. 8:  68.7% with respect to HP virus 48
DNA of FIG. 9:  76.6% with respect to HP virus 48
DNA of FIG. 10: 81.8% with respect to HP virus 68

[0022] According to the invention, the above DNA can be present in a vector and expression vector, respectively. A person skilled in the art is familiar with examples thereof. In the case of an expression vector for E. coli, these are e.g pGEMEX, pUC derivatives, pGEM-T and pGEX-2T. For the expression in yeast e.g. pY100 and Ycpadl have to be mentioned, while for the expression in animal cells e.g. pKCR, pEF-BOS, cDM8 and pCEV4 have to be indicated.

[0023] The person skilled in the art knows suitable cells to express the above DNA present in an expression vector. Examples of such cells comprise the E. coli strains HB101, DH1, x1776, JM101, JM 109, and XL1-Blue, the yeast strain Saccharomyces cerevisiae and the animal cells L, NH-3T3, FM3A, CHO, COS, Vero, and HeLa.

[0024] The person skilled in the art knows in which way the above DNA has to be inserted in an expression vector. He is also familiar with the fact that the above DNA can be inserted in connection with a DNA coding for another protein and peptide, respectively, so that the above DNA can be expressed in the form of a fusion protein.

[0025] A further subject matter of the invention relates to a papilloma virus genome which comprises the above DNA. The expression “papilloma virus genome” also comprises an incomplete genome, i.e. fragments of a papilloma virus genome, which comprise the above DNA. This may be e.g a DNA coding for L1 or a portion thereof.

[0026] A common process can be used for the provision of the above papilloma virus genome, which comprises the following processing steps:

[0027] (a) isolation of the total DNA from a biopsy of epithelial neoplasm,

[0028] (b) hybridization of the total DNA of (a) with the above DNA so as to detect a papilloma virus genome included in the total DNA of (a), and

[0029] (c) cloning of the total DNA of (a) containing the papilloma virus genome, in a vector and optionally subcloning the resulting clone, all processing steps originating from common DNA recombination technique.

[0030] As far as the isolation, hybridization and cloning of cell DNA is concerned, reference is made by way of supplement to Sambrook et al., Molecular Cloning A Laboratory Manual, second edition, Cold Spring Harbor Laboratory (1989).

[0031] The expression “epithelial neoplasm” comprises any neoplasms of epithelium in man and animal. Examples of such neoplasms are warts, condylomas in the genital zone and carcinomas of the skin. The latter are used preferably to isolate the above papilloma virus genome.

[0032] The expression “vector” comprises any vectors suitable for cloning chromosomal DNA and extrachromosomal DNA, respectively. Examples of such vectors are cosmids such as pWE15 and Super Cos1, and phages such as λ-phages, e.g. λZAP expression vector, λZAPII vector and λgt10 vector. In the present case, λ-phages are used preferably. The above vectors are known and obtainable from the company of Stratagene.

[0033] Papilloma virus genomes according to the invention may be present in integrated form in chromosomal DNA or in extrachromosomal fashion. The person skilled in the art is familiar with processes serving the clarification thereof. He also knows processes serving for finding out the optimum restriction enzymes for cloning the papilloma virus genomes. He will orient himself by genomes of known papilloma viruses. In particular, the person skilled in the art will pay corresponding attention to the above-mentioned HP viruses.

[0034] The provision of a papilloma virus genome referred to as VS19-6 is described by way of example. For this purpose, the total DNA is isolated from a biopsy of a squamous cell carcinoma, cleaved by BamHI and separated eletrophoretically in an agarose gel. The agarose gel is then subjected to a blotting method so as to transfer the DNA to a nitrocellulose membrane. It is inserted in a hybridization method in which the DNA of FIG. 1 is used as labeled sample, optionally in combination with a DNA of HP virus 65. Hybridization with the papilloma virus DNA present in the total DNA is obtained.

[0035] Moreover, the above total DNA cleaved by BamHI is cloned in a λ-phage. The corresponding clones, i.e. the clones containing the papilloma virus DNA are identified by hybridization with the DNA of FIG. 1, optionally in combination with a DNA of the HP virus 65. The insert of these clones is then subjected to a further cloning in a plasmid vector so as to obtain a clone which contains the papilloma virus genome VS19-6-G. The genome is confirmed by sequencing.

[0036] Further papilloma virus genomes are provided analogously. They are designated in accordance with the DNAs used for their provision, namely by: VS200-1-G, VS201-1-G, VS202-8-G, VS203-2-G, VS204-4-G, VS205-1-G, VS206-2-G, VS207-22-G and VS208-1-G, respectively.

[0037] A further subject matter of the invention relates to a protein which is coded by the above papilloma virus genome. Such a protein is e.g. a major capsid protein (L1) or a minor capsid protein (L2). An above protein is prepared as usual. The preparation of L1 and L2, respectively, of the papilloma virus genome VS19-6-G is described by way of example. For this purpose, the HP virus 65 related to the DNA of FIG. 1 is used. The full sequence and the position of individual DNA regions coding for proteins are known in connection therewith. These DNAs are identified on the papilloma virus genome VS19-6-G by parallel restriction cleavages of both genomes and subsequent hybridization with various fragments concerning the DNA encoding L1 and L2, respectively. They are confirmed by sequencing. The DNA coding for L1 is referred to as VS19-6-G-L1 DNA and the DNA coding for L2 is referred to as VS19-6-G-L2 DNA.

[0038] Furthermore, the DNA coding for L1 and L2, respectively, is inserted in an expression vector. Examples thereof are mentioned above for E. coli, yeast and animal cells. In this connection, reference is made to the vector pGEX-2T as regards the expression in E. coli by way of supplement. Kimbauer et al., supra. Having inserted the VS19-6-G-L1 DNA and VS19-6-G-L2 DNA, one obtains pGEX-2T-VS19-6-G-L1 and pGEX-2T-VS19-6-G-L2, respectively. After transforming E. coli, these expression vectors express a glutathione S transferase L1 fusion protein and glutathione S transferase L2 fusion protein, respectively. The proteins are purified as usual.

[0039] The bacculovirus system and vaccinia virus system, respectively, is mentioned for a further expression of the above DNA encoding L1 and L2, respectively. Expression vectors usable for this purpose are e.g. pEV mod. and pSynwtVI for the bacculovirus system. Kirnbauer et al., supra. Especially vectors with the vaccinia virus “early” (p7.5 k) promoter and “late” (Psynth, p11K) promoter, respectively, have to be mentioned for the vaccinia virus system. Hagensee et al., 1993, Journal of Virology 67:315-322. The bacculovirus system is preferred in the present case. Having inserted the above DNA encoding L1 and L2, respectively, in pEV mod., one obtains pEVmod.-VS19-6-G-L1 and pEVmod.-VS19-6-G-L2, respectively.

[0040] The former expression vector as such or both expression vectors jointly lead to the formation of virus-like particles after infection of SF-9 insect cells. In the former case, such a particle comprises an L1 protein, while in the latter case, it contains an L2 protein in addition to an L1 protein.

[0041] A virus-like particle of the latter case is also obtained by inserting the above VS 19-6-G-L1 and VSI9-6-G-L2 DNAs jointly in the expression vector pSynwtVI and using the resulting pSynwtVI-VS19-6-G-L1/L2 for the infection of SF-9 insect cells. The above virus-like particles are purified as usual. They also represent a subject matter of the invention.

[0042] A further subject matter of the invention relates to an antibody directed against an above protein and virus-like particle, respectively. The preparation thereof is made as usual. It is described by way of example for the preparation of an antibody which is directed against a virus-like particle comprising L1 of VS19-6-G. For this purpose, the virus-like particle is injected subcutaneously into BALB/c mice. This injection is repeated at intervals of 3 weeks each. About 2 weeks after the last injection, the serum containing the antibody is isolated and tested as usual.

[0043] In a preferred embodiment, the antibody is a monoclonal antibody. For its preparation, spleen cells are removed from the mice after the above fourth injection and fused with myeloma cells as usual. The further cloning also takes place according to known methods.

[0044] By means of the present invention, it is possible to detect papilloma viruses, particularly in carcinomas of the skin. For this purpose, the DNA according to the invention can be used as such or when comprised by a further DNA. The latter may also be a papilloma virus genome or a portion thereof.

[0045] The present invention also enables the provision of formerly unknown papilloma viruses. They are found especially in carcinomas of the skin. In addition, the invention supplies proteins and virus-like particles which originate from these papilloma viruses. Moreover, antibodies are provided which are directed against these proteins and particles, respectively.

[0046] The present invention also enables to take diagnostic and therapeutic steps in the case of papilloma virus diseases. Moreover, it supplies the possibility of building up a vaccine against papilloma virus infections. Thus, the present invention represents a break-through in the field of papilloma virus research.

[0047] The below examples explain the invention in more detail. The following preparations and examples are given to enable those skilled in the art to more clearly understand and to practice the present invention. The present invention, however, is not limited in scope by the exemplified embodiments, which are intended as illustrations of single aspects of the invention only, and methods which are functionally equivalent are within the scope of the invention. Indeed, various modifications of the invention in addition to those described herein will become apparent to those skilled in the art from the foregoing description and accompanying drawings. Such modifications are intended to fall within the scope of the appended claims.

EXAMPLES

A. Example 1

Identification of the Papilloma Virus Genome VS19-6-G

[0048] The total DNA is isolated from a biopsy of a squamous cell carcinoma of an immuno-suppressed person. 10 μg of this DNA are cleaved by the restriction enzyme BamHI and separated electrophoretically in a 0.5% agarose gel. At the same time, 10 μg of the above DNA, which was not cleaved, is also separated. The agarose gel is subjected to a blotting method so as to transfer the DNA from the agarose gel to a nitrocellulose membrane. It is employed in a hybridization method in which the above DNA of FIG. 1 is used in combination with the HP virus-65 DNA as 32P-labeled sample. Hybridization with the blotted DNA is obtained.

[0049] The person skilled in the field of DNA recombination technique is familiar with the above methods. Reference is made to Sambrook et al., supra, by way of supplement.

Example 2

Cloning of the Papilloma Virus Genome VS19-6-G.

[0050] The biopsy DNA obtained from Example 1 is cleaved by the restriction enzyme BamHI. The resulting fragments are used in a ligase reaction in which the dephosphorylated vector λZAP express cleaved by BamHI is also present. The resulting recombinant DNA molecules are packed in bacteriophages, and they are used for infecting bacteria. For these processing steps, the ZAP express vector kit offered by the company of Stratagene is used. The resulting phage plaques are then subjected to a hybridization process which uses the 32P-labeled DNA of FIG. 1 employed in Example 1 in combination with 32P-labeled HP virus-65 DNA. Hybridization with corresponding phage plaques is obtained. The BamHI fragments of VS19-6-G are isolated therefrom and used in a further ligase reaction together with a BamHI-cleaved, dephosphorylated plasmid vector, pBluescript. The resulting recombinant DNA molecules are used for transforming bacteria, E. coli XL 1-Blue. By restriction cleavages and hybridization with the above DNA samples, respectively, a bacterial clone containing the papilloma virus genome VS19-6-G is identified. The plasmid of this bacterial clone is referred to as pBlue-VS19-6-G.

[0051] All references cited within the body of the instant specification are hereby incorporated by reference in their entirety.

Claims

1. A DNA coding for a peptide of a papilloma virus major capsid protein, wherein the peptide comprises the amino acid sequence of FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9 or FIG. 10 or an amino acid sequence differing therefrom by one or more amino acids.

2. The DNA according to claim 1, characterized in that the DNA coding for the peptide of the papilloma virus major capsid protein comprises the base sequence of FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9 or FIG. 10 or a base sequence differing therefrom by one or more base pairs.

3. A papilloma virus genome including the DNA according to claim 1 or 2.

4. A process for providing the papilloma virus genome according to claim 3, comprising the following processing steps: (a) isolation of the total DNA from a biopsy of epithelial neoplasm, (b) hybridization of the total DNA of (a) with a DNA according to claim 1 or 2 so as to detect a papilloma virus genome included in the total DNA of (a), and (c) cloning of the total DNA of (a), containing the papilloma virus genome, in a vector and optionally subcloning the resulting clone, all processing steps originating from conventional DNA recombination technique.

5. A protein, coded by the papilloma virus genome according to claim 3.

6. The protein according to claim 5, characterized in that it is a papilloma virus major capsid protein.

7. The protein according to claim 5, characterized in that it is a papilloma virus minor capsid protein.

8. An expression vector, comprising a DNA coding for the protein according to claims 5-7.

9. A transformant containing the expression vector according to claim 8.

10. A process for the preparation of the protein according to any one of claims 5-7, comprising the cultivation of the transformant according to claim 9 under suitable conditions.

11. A virus-like particle, comprising the papilloma virus major capsid protein according to claim 6.

12. The virus-like particle according to claim 11, comprising additionally the minor capsid protein according to claim 7.

13. An antibody directed against the protein according to any one of claims 5-7.

14. The antibody directed against the virus-like particle according to claim 11 or 12.

15. Use of the DNA according to claim 1 or 2 as a reagent for diagnosis.

16. Use of the protein according to any one of claims 5-7 as a reagent for diagnosis, treatment and/or vaccination.

17. Use of the virus-like particle according to claim 11 or 12 as a reagent for diagnosis, treatment and/or vaccination.

18. Use of the antibody according to claim 13 or 14 as a reagent for diagnosis and/or treatment.